[Findit] Implement retry within swarming_util.py when making server calls

appengine/findit/waterfall/test/wf_testcase.py

Index: appengine/findit/waterfall/test/wf_testcase.py
diff --git a/appengine/findit/waterfall/test/wf_testcase.py b/appengine/findit/waterfall/test/wf_testcase.py
index bd2bbc48db3b6b69349f58482c76520574b1022d..e2e1ab9499b96744b99d1ae556b459565758b2df 100644
--- a/appengine/findit/waterfall/test/wf_testcase.py
+++ b/appengine/findit/waterfall/test/wf_testcase.py
@@ -93,6 +93,9 @@ _DEFAULT_SWARMING_SETTINGS = {
     'iterations_to_rerun': 10,
     'get_swarming_task_id_timeout_seconds': 5 * 60,  # 5 minutes.
     'get_swarming_task_id_wait_seconds': 10,
+    'server_retry_timeout_hours': 2,
+    'maximum_server_contact_retry_interval_seconds': 5 * 60,  # 5 minutes.
+    'should_retry_server': False,  # No retry for unit testing.
 }